Combined legume and non-legume residues management improve soil organic matter on an Oxisol in Brazil
Jônatas Pedro da Silva 
, José Ferreira Lustosa Filho , Rafael da Silva Teixeira , Ana Márcia Tresinari Xavier , Ivo Ribeiro da Silva , Emanuelle Mercês Barros Soares
12/Dec/2022
ABSTRACT Understanding soil organic matter (SOM) dynamics in production systems on tropical soils is necessary to guide strategies to increase SOM formation. This study aimed to evaluate soil carbon (C) dynamics by combining applications of different plant residues used on tropical soils. An incubation study was carried out with and without adding millet (Pennisetum americanum) residues combined with six crop residues (legumes and non-legumes); and one additional treatment with only millet residue. Higher C-CO2 fluxes recorded in jack bean, sunflower […]
Different N-fertilization sources affecting the native soil organic matter mineralization on Technosols under iron ore tailing
Paula Afonso de Oliveira , Igor Rodrigues de Assis , Luiz Eduardo Dias , Ivo Ribeiro da Silva , Gustavo Magalhães Nunes Barbosa , Rafael da Silva Teixeira , [...]
26/Nov/2020
ABSTRACT: Accidents related to the rupture of iron ore tailings dams have dramatically impacted on the Brazilian natural ecosystem. So, the development of strategies to recover soil organic matter levels and build-up Technosols are required. This study aimed to evaluate the effect of N-mineral and -organic fertilization and the rhizospheric effect on soil organic matter mineralization from Technosols built under iron ore tailings. The experiment was carried out in a greenhouse; we used a factorial scheme 2 × 2 × […]
Input of dissolved carbon and its influence on humic substances content in an Oxisol
01/Dec/2005
The aim of this study was to quantify the contribution of soluble organic-C deposition by rice root system and the CO2 evolution during 64 days in an Oxisol samples treated with glucose, and rice roots collected at different plant growth stages (40, 60, 80, 100, 120 and 140 days after sowing). Thereafter, organic matter was fractionated to evaluate the effect of the addition of a root system on the soil humus composition. It was possible to observe the intense rhizodeposition of organic […]
Mineralization of nitrogen incorporated as green manure in three soils of Central Amazon, Brazil
01/Sep/1997
This study was carried out under laboratory conditions from September to December, 1992. The objective was to evaluate the mineralization of nitrogen in cowpea (Vigna unguiculata L.) green manure, using 15N as tracer, in three major soils of Central Amazon: an Oxisol, an Ultisol and a Low-Humic Gley. The variation in amount and form of the mineral N from cowpea residues was related to the chemical characteristics of each soil. In the Oxisol and Ultisol the incorporation of green manure […]